// /* getsputs.c -- 使用 gets() 和 puts() */
// #include <stdio.h>
// #define STLEN 81
// int main(void)
// {
//     char words[STLEN];
//     puts("Enter a string, please.");
//     gets(words); // 典型用法
//     printf("Your string twice:\n");
//     printf("%s", words);
//     puts(words);
//     puts("Done.");
//     return 0;
// }

/* str_cat.c -- 拼接两个字符串 */
#include <stdio.h>
#include <string.h> /* strcat()函数的原型在该头文件中 */
#define SIZE 80

char * s_gets(char * st, int n);

int main(void)
    {
    char flower[SIZE];
    char addon [] = "s smell like old shoes.";
    puts("What is your favorite flower?");
    if (s_gets(flower, SIZE))
    {
        strcat(flower, addon);
        puts(flower);
        puts(addon);
    }
    else
        puts("End of file encountered!");
    puts("bye");
    return 0;
}
char * s_gets(char * st, int n)
{
    char * ret_val;
    int i = 0;
    ret_val = fgets(st, n, stdin);
    if (ret_val)
    {
        while (st[i] != '\n' && st[i] != '\0')
            i++;
        if (st[i] == '\n')
            st[i] = '\0';
        else
            while (getchar() != '\n')
            continue;
    }
    return ret_val;
}